Plate IV. 



Fig. 1. Foliiiices pallidus Brod. et Sow. a. Back-view. b. Front-view. Kosliiba. p. 77; 

 Fig. 2. Folium lnteostemurn Kiist. a. Back-view. b. Front-view. Motowada. p. 66. 

 Figs. 3, 4. Triton subpyrùm Yok. 3a. Back-view. 3b. Front-view of a perfect 

 specimen from Matsune near Ninomiya in Sagami. 4. Fragment 

 from Naganuma. p. 65. 

 Fig. 5. Calyptraea inammilaris Brod. a. Yiew frcm above. b. Yiew from below, 

 c. Yiew from side. Kami-Miyata. p. 75. 

 Trichotropis planicostata Yok. Enlarged. Kosliiba. p. 70. 

 Thylacodes medusae Pils. Shimo-Miyata. p. 71. 

 Bittium binudnlosnm Yok. Enlarged. Yokosnka. p. 68. 

 Potamides multiformis Lke. a. Front-view. b. Back-view. Otsu. p. 69. 

 Ceritbium kobelti Dkr. Enlarged, a. Front-view. b. Back-view. Otsu. p. 66. 

 Triforis otsuensis Yok. Enlarged, a. Front-view. b. Back-view, Otsu. p. 69. 

 Fenella orientalis Yok. Enlarged, a. Front-view. b. Back-view. Yokosnka. 



p. 74. 

 Bittium perpusillum Dkr. Enlarged, a. Front-view. b. Back-view. Yoko- 

 snka. p. 67. 

 Potamides fluviatilis Pot. et Mich. a. Front-view. b. Back-view. Otsu. p. 68. 

 Eissoina submerculialis Yok. Enlarged, a. Front-view. b. Back-view. 

 Yokosnka. p. 73. 

 Figs. 16, 17, 18, 19. Turritella nipponica Yok. 16. Kosliiba. 17. Nojima. 18. 



Kanazawa. 19. Kami-Miyata. p. 71. 

 Fig. 20. Eissoina zeltnerioides Yok. Enlarged, a. Front-view. b. Back-view. Yo- 

 kosnka. p. 73. 

 Fig. 21. Solarium lenticulatum Yok. Enlarged, a. Side-view. b. Base-view. Ko- 

 sliiba. p. 72. 

 Figs. 22, 23. Crepidula orbella Yok. Enlarged, a. Inside-view. b. Outside-view. 

 c. Side-view. Naganuma. p! 76. 



